Added sessions controller and user authentication
fixed flash alerts for log in and log out
replaced model and controller for project_user with user_project for clarity, revised some routes
started work on nested resource before switch to master branch
commented out file upload code to test heroku
commented rspec tests for heroku debug
deleted project users files
added back file upload and rspec tests
commit before merge
Merge branch 'userauth'

Conflicts:
	db/migrate/20131210234546_create_user_projects.rb
	spec/models/user_project_spec.rb
commented out user_projects before deploy test;
Updated seed file and fixed nested resources"
commit befoe branching to fix user_project associations
added some styling